Why? If the transactions logged on the blockchain contain annotations about your identity, you (as described by those annotations) would still own the house, o

Why? If the transactions logged on the blockchain contain annotations about your identity, you (as described by those annotations) would still own the house, only an impersonator matching those annotations as good as you would be able to challenge your ownership. On a blockchain without any fallbacks you would lose any ability to ever transfer ownership. As for future generations, will anyone could claim it but your heirs might have a better shot at it than a random impersonator.